I have the same issue. The mobile site works without login (but just posts no comments can be seen), the desktop/full site demands a login after a few seconds and greys out all posts. Been like this for a week. I’ve Stopped reading the FB updates because of this. Must be FB server side then if nothing’s changed in the group. Pity it’s so damn popular as it’s no place to archive interesting posts due to its dodgy search.

Too many angels and not enough devils. That's the problem with this forum. You need some bully-trolls to come along and poke you old gits a bit with some sharp sticks. Liven y'all up.
Don't worry though friends, I've got ya covered.